1.
http://www.sciencedirect.com/sci ... 192dbc8f6ea28dfbf1b
2.
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDY-4PKP4DX-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=527a613d9c04cd1a3fa126a01e08c7a4
在线等,谢谢~~~